Police are appealing for information after the Anzac War Memorial in Sydney's Hyde Park was allegedly vandalised last week.

Officers were called to the memorial shortly before midnight on Friday, September 11, following reports of malicious damage. Police were told that an unknown man, who was walking with a group of people, stopped at the memorial and allegedly spray-painted graffiti on a pillar before leaving the area.

Despite efforts to clean the affected area, police say the memorial remains damaged.

Sydney City police are continuing their investigation and have released CCTV footage and images of a man they believe may be able to assist with inquiries.

The person police are seeking information about was reportedly walking with a group when the alleged vandalism occurred. Investigators are asking members of the public who may have witnessed the incident or recognise the person to contact police.

The Anzac War Memorial is located in Hyde Park in central Sydney and is a significant memorial site. Damage to the site has prompted police to seek further information about what occurred during the September 11 incident.

According to police, the investigation remains ongoing. Officers are examining available CCTV footage and other information as they work to identify the person involved.

Police have described the incident as malicious damage and are asking anyone with relevant information to come forward.

The investigation is focused on identifying the person shown in the released images. Police have provided a description of the man to assist members of the public who may have information.

At the time he was last seen, police said the man was wearing a navy-blue T-shirt and jacket, beige cargo pants and carrying a backpack. Police also described him as having short black hair and wearing glasses.

Anyone who witnessed the incident, has information about the alleged vandalism or believes they can identify the person in the CCTV images is being asked to contact Sydney City Police or Crime Stoppers.

The release of CCTV footage is part of the ongoing investigation and does not establish guilt against the person shown in the images.

Police continue to investigate the circumstances surrounding the damage to the memorial.